Aircraft



June 5, 1928.

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H. E. KRAMMER AIRCRAFT Filed April 24. 1920 54m-umida Aff ry Elf/ram mer' June 5, 192s. 1,672,163-

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H.E.KRAMMER AIRCRAFT Filed Apri124. 1920 15 Sheets-Sheet '7 'June 5, 1928. 1,672,163*

H. E. KRAMMER AIRCRAFT Filed April 24. 1920 l5 Sheets-Sheet 8 llllll 1,14 'i x 1 June 5, 1928. 1,672,163

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H. E. KRAMMER AIRCRAFT l5 Sheets-Sheet ll ATTORNEY Filed Apri124. 1920 V11 W3 1.3.11 L N u June 5, 1928. l,672,l63

H. E. KRAMMER AIRCRAFT Filed r11 g4. 1930 15 snee eet 12 ATTORNEY June 5, 1928i. 1,672,163

H. E. KRAMMER l' 'ATTORNEYS 'June 5, 1928. 1,672,163

H. E. KRAMMER AIRCRAFT Filed April 24. 1920 l5 Sheets-Sheet 14 L i" i' l' vln l \a 1 "1 i l 5V l m w; I Q 611? 60 A 6g Q 60 60 Q )1, 4 d l mvENroR y? 23 Henry Efmmmer BY v ` ATTORNEY June 5, 1928.

H. E. KRAMMER AIRCRAFT Filed April 24- 1920 15 sheets-sheet 1,5

INVENTOR HenryEJrammer ATTORNEY Patented June 5, 1928.

PATENT ori-uca.

HENRY E. KRAMMER, OF NEW YORK, N. Y.

AIRCRAFT.

Application led April 24, l1920. Serial No. 378,325.

This invention relates to aircraft, and my improvementsI are directed particularly to the production of an integral structure embodying provisions for both buoyant and dynamic lift and sustentation in air, said structure also including means for the separation of the buoyant and dynamic lift units; and, still further, said dynamic lift unit including separable flotation means for use on water, wherein said flotation means itself" may constitute a distinct unit for service alone or in conjunction with the dynamic lift unit.

Thus my invention may be said to com,- prise a composite craft wherein, (1) the buoyant support of a dirigible is augmented by the dynamic lift of an airplane; (2) wherein the dirigible is dis-engagable from the airplane and operable solely as a lighterthan-air craft; (3) wherein the airplane is disengageable from the dirigible and is operable solel as a heavier-than-air craft; (4) wherein t 1e airplane, in conjunction with the flotation element, is operable as a flying boat; (5) wherein the flotation element, upon disassociation from the airplane, is operable as a speed boat or land vehicle either for military or other purposes; and (6) wherein means of intercommunication are provided between the cabin of the dirigible and the fuselage of the'heavierthan-air machine to permit the pilot or other persons carried by said cabin and fuselage to pass with safety from one craft to the other, while in engaged relation, so that in the eventl one of said crafts becomes disabled the occupants thereof may find security in the other craft before the disabled craft is separated therefrom.

In the practical embodiment of these inventive features, wherein the dirigible, airplane, and boat are all united in integral formation for inter-related effect, the framework ofthefcomposite structure supports integrally the gas bag unit with its component elements, and the boat unit with its component elements. Those parts of the framework however which connect the dirigible with the airplane are rupturable as by the means described in my co-pending application Serial No. 243,564 so that these two units may be separated one from the other in case one is destroyed and it is desirable to relieve the other from association therewith;

or provided the occasion arises for the independent use of either or both of said units.

Also, similar means for rupturing the connections between the airplane and its boat are provided so that if in the operation of these units as a seaplane the airplane should be destroyed or damaged it may be separated from the boat, which latter having the power plant and steering means, and being provided with offensive and defensive means, may.l then be operated exclusively as a. boat, wit out incumbrance of any kind.

1ikuxiliary features of my invention inc u e:

1. Means upon the surface of the dirigible .the car to the top of the dirigible.

4. The dirigible provided with gun turrets which normally are concealed within vertical passages in the body of the gas bag, but having telescopic means of elevation, operable by compressed air for service.

5. Power plants for the dirigible carried by hangers depending from the bottom of the dirigible, and divided fuel compartments loate'd in the dirigible bottom with pipe lines leading therefrom to said power plants.

6. Stout vertical posts secured to the dirigible bottom anddepending therefrom to securely engage the boat in the composite arrangement, said posts having rupturable connections, as premised.

7. Aerofoils mounted upon the boat by rupturable connections.

8. A pipe extending from the fuel supply in the dirigible car and extended through an intervening aerofoil to the boat, for the gravity supply of fuel to the power plant thereof, said pipe having means for automatic closure when the dirigible and the boat are separated, to conserve the fuel.

Q. Forward and stern power plants in the boat, wherein the forward power plantis movably mounted for the variation of its shaft, and hence the axis of its ropeller,

between a. horizontal plane and a orwardlyv by com ressed air operating a telescopic mount or service.

12. Means of communication between the cabin of the boat andthe car of the dirigible.

13. The provision of steadying pontoons carried by and extending from the sides of the boat.

In the practice of my said invention for war purposes it will be found of inestimable value because by its means different airorafts, whether of the same general character, or of dierent characters and types, being associated, may operate together, thereby rendering what I call the composite aircraftcapable of utilizing,` unitedly, the characteristic qualifications of each unit. But if in battle action one unit of those in the assembled structure, or any element of such unit, should be destroyed, then that unit, or element thereof, by the means comprised herein, can be separated from the whole structure. Furthermore the gunners or other persons on a disabled unit are by my invention enabled to seek safety in passing from said disabled unit to a whole unit, before separation of the units.

In the drawings Figure 1 is a side elevation of the coms posite structure comprising my invention, the dirigible unit thereof being broken away because its full length could not be represented in the available space.

Fig. 2 is a'vertical side sectional partial view, enlarged, thereof.

Fig. 3 is a front partial end view of the same structure, on a still larger scale.

Fig. 4, is a side elevation, partly in vertical section, of a dirigible section.

Fig. 5, is an end view looking into the conoidal recess in a dirigible section.

' Fig. 6, is a sectional elevation of an adjustment post for the air screw power plant.

Fig. 7, is an elevation partly in vertical section of a fuel pipe line with automatic valve closure means.

Fi 8, is a partial lan view of a cover mem er for the dirig le runway or recess.

Fig. 9, is a detail of the sprocket and chain operating means for adjusting the positions o the power plants.

. Fig. 10, is a graphic view showing the dirigible and seaplane after disconnection.

Fig. 11, is a graphic view of the boat from which the airplane elements have been disconnected.

Fig. 12, is a detail, partly in section, of two members united by rupturable connection means. v

Fig. 13, is a partial sectional side elevation, broken away, of a dirigible having a landing and starting runway for a scout airplane.

Fig. 14, is a similar view, showing the recess cover, bearing the scout airplane, elevated for taking of? purposes.

Fig. 15, is a top plan view of the dirigible, showing the runway and enlarged entrance thereto.

Fig. 16, is a section on the line 16-16 of Fig. 15.

Fig. 17, is a side elevation of a combine flotation and land craft.

Fig. 18, is a front elevation thereof.

Fig. 19, is a side view of a submersible craft.

Fig. 20 is a side elevation of a composite craft, comprising in integrated form, a

lighter-than-air unit, a plurality of heavierthan-air units, and a flotation unit.

Fig. 21 is a front elevation of the same craft, disintegrated to the extent that the flotation unit has been separated from the other units.

Fig. 22 also shows the same craft, but dis integrated to the extent that a heavier-thanair unit has been separated from the other units.

Fig. 23 likewise shows the same craft, but disintegrated to the extent that a heavierthan-air unit, with flotation unit, have been separated together from the lighter-thanair unit, and

Fig. 24 is a similar view to Fig. 23, excepting that here a heavier-than-air unit has been extended above the top of the lighterthan-air unit in-order to bring. into operation the power plant of said heavier-than-air unit.

For general description purposes, let 1 indicate a dirigible, the numeral being applied to the usual outer envelope; while 2 indicates a boat or iotation element, and 3, 4, respectively the upper and lower aerofoils of a biplane unit, representing an airplane, which is connected with the fuselage as by saddle 2s. The ldirigible structure, interiorly of its envelope, is composed of sections which fit togctherlongitudinally, the present drawings illustrating three of said sections, 5, 6, and 7, although obviously the number of sections may be varied.v As here shown, however, there is a bow section (5), central loo . structure.

section (6) and stern section (7). The central section 6 has oppositely projecting conoidal ends, 8, 9, each having external lengthwise ribs or flanges 10 adapted to engage lengthwise grooves or guide ways 11 which are formed in the outer surfaces of conoidal recesses 12, 13, provided in the respectively adjacent ends of the sections 5 and 7, to thereby secure said sections in their assembled position, against relative rotation.

The central section Ghas at each end a closure wall that is inset from the extreme end of a conoidal formation thereof, leaving an outer end recess 15 in which may be lodged a powerful helical spring 16, which, in the assembled position of the sections, bears oppositely against an end closure wall 17 in either of the recesses 12 or 13,' the purpose of said springs being to forceably separate adjacent dirigible sections when released.

The sections 5, (3 and 7, which are constructed of some light and stiff material, such as aluminum or an aluminum alloy, reinforced as by longitudinal brace 18, ribs 19. and tension members 20, have means of rupturable engagement whereby in service,

they are united in an homogeneous integral For this purpose an annular recess 21 is formed at each opposed end of adjacent sections, and a pair of bolts or screws 22 (see Fig. 12) which are in axially aligned relation, are respectively screwed into or otherwise securely engaged with the opposed end poritions of the adjacent sections. Said bolts or screws each have thereon a shoulder 23, which may be in the form of a nut that is threaded thereon, and said shoulders areeach engaged by a housing 24, which housings comprise integral extensions at opposite sides of a chamber 25, that contain fulminate or some explosive that is suiiiciently powerful in its explosive effect to rupture its chamber 25, to thereby sunder the bolts 22 and thus to completely release the sections of the dirigible one from another.

The explosive may be discharged by elec trical means as more fully described in my co-pending application Serial No. 243,564.

In Fig. 4 I have shown a contour forming bow section 2G to enclose the conoidal pol'- tion of the forward section and to accord to the dirigible bow the appropriate shape wherewith it can best oppose the pressures met in speed travel. Obviously, though not shown, a corresponding covering, with appropriate stream-lined contour, may be applied to the rear section of the dirigible.

As means for'driving the dirigible, either alone or in conjunction with the other ele ments of the composite structure, I provide power plants contained in stream-lined housings 27, with propellers 28, and carried by hangers 29 which depend from the dirigible.

Also, to supplement the buoyant lift of appearing gun turrets which normally arel concealed. entirelywithin the structure ot' the dirigible, so as to be out of sight and also to present no additional head resistance during flight. In Fig. 2 these turrets are indicated at 31 as mounted upon telescopic supports 32 which themselves are carried by the longitudinal brace member 18, each turret and its mount being contained within a tubular well 33 that extends up to the top surface of the dirigible. At the left in Fig. 2, a turret is shown as contained Within its well, with its mount collapsed, and at the right in said figure a turret. having an entrance 31d, is shown as elevated above the top surface of the dirigible, for service, its mount having been extended for thatV purpose, either by the use of compressed airas the lifting means, as lin my copending application Serial No. 243,565 o'r otherwise.

In Fig. 13, where the well 33a is shown as depending below brace 18, the turret 31a there indicated has a concentric sleeve 34 between it and said well, and lugs 35 upon the turret are slidable in vertical slots 36 in said sleeve to the top of said slots, Whereafter further upward movement of said turret extends the sleeve, thus `imparting telescopic effect to the turret itself and according it a guided rise beyond the upper sur? face of the dirigible. This form of turret mechanism is especially applicable in the instance of its employment in the form of my invention illustrated in Figs. 13 and 14, where a depressed channel or passage 37 is formed longitudinally in the upper part of the dirigible. Said passage 37 has a variety of uses, one of which is to serve as an observation, walled platform, reached from the car or cabin 38 by means of a vertical conduit 39 that extends right through the-body of the dirigible, from bottom to top thereof. An elevator, in the form of a telescopic mount 40, seated in the car 38, and carrying a cage 41, is adapted to be extended up through said conduit into engagement with a movable cover member 42, said cage having a top portion 43 that engages an orifice 43a in cover 42, thereby lifting said cover away from the rigid floor 44 of passage 34. to thus provide a cover for said passage. Obviously the top portion 43 maybe hollow` that occupants of the cage may have observation over the top of the passage way, and also the cage may have means of egress into the passage Way. The movable cover 42 is provided with guides 45, working in slots 46 in the sides of the passage way, to facilitate its elevation and descent.

lll

Another function of the passage way 37 is to receive the landin gear and fuselage of a small or scout airp ane, as 2*, alighting on the top of the dirigible, for which purpose the passage way at its ends is expanded, as shown in Fig. 15, into a liared entrance 47, whereby the airplane in landing approximately in the line of said passage way at its flared entrance, will be guided into the channel thereof, the wings only of said airplane being exposed above said passage way. In Fig. 13 the passage wa is shown as approached by a gentle dec ivity; and, in Fig. 14 as having a corresponding exit, wherefrom the airplane may take off. For taking off, the movable cover 42, to which the airplane may have been secured as by arupturable connection 48, may be elevated, to

thus carry the airplane up into a level plane.

It will be appreciated by those versed in the art of aviation that the alighting of an airplane upon a dirigible will be facilitated by approximately synchronizing the .speeds of the two crafts while travelling Iin the same direction at the time df attempting the landing; and that in taking oil' of the airplane the speed of travel of the dirigible in the intended launching direction, against the wind, will be a material factor for a successful launching. v

Fuel for the dirigible engines is shown as contained in a compartmented reservoir 49 that is inset completely within the hull contour of the dirigible at its underside, fuel being conveyed from said reservoir to the power plants as by piping 50.

vThe car or cabin 38 is also partly inset within the bottom of the dirigible to reduce the head resistance presented thereby, and, as shown in Fig. 2, its insertion is effected in an upwardly recessed portion of the fuel reservoir 49. Said car or cabin, which extends longitudinally of the dirigible, has a forward compartment 51 for the pilot, and rearwardly thereof said car or cabin is divided into upper and lower portions 52 and 53 respectively, the upper portion 52 serving for the storage of merchandise or ammunition or for occupation by passengers, and the lower portion comprising a compartmented fuel reservoir, from which a fuel delivery pipe 54 depends-to furnish fuel for the airplane and boat power plants. Also the reservoir 53 is pierced by a well or conduit 55 as means of communication from below with the compartment 52.

The boat 2, which mayv have the general structural characteristics referred to in my co-pending application Serial No. 243,565 is pendently connected rigidly with the dirigible by means of stout posts 'each in two parts 56, 57, wherein said parts are in rupturable engagement, by means as at 58, which may correspond with the means shown in Fig. 12, so that by the separation :,o'vales order that said sup orting unit may be disconnected from the oat in case of necessity.

The boat structure has one or more wells 61, to contain gun turrets 62, which latter while `normally contained each within its well, can be elevated for service as by a telescopic mount 63 that is carried by a lower deck 64 of the boat. Also, an upper chamber in the boat,having deck 65, is divided into compartments, whereof the forward compartment contains the pilots seat and controls, together with an aviation motor 66, whose shaft 67 carries the airscrew propeller 68; the intermediate compartment is provided with passenger accommodation, and the rear compartment .may serve as a toilet. room.

A pole 69, or other means of communication. is provided to extend from the intermediate compartment with the interior of the dirigible car or cabin 38, said pole for that purpose extending through the well or conduit 55 in said car or cabin.

The fuel pipe 54 through which fuel passes by gravity to the boat for use by its engines, is more completely shown in Fig. 7 as formed in two parts, with a coupled enlargement comprising a valve chamber. Thus the upper part of said coupling has the enlargement 70, containing a valve seat 71, and the lower part has a correspondin opposed enlargement 72 that fits over a re uced portion 73, of enlargement 70, said lower part also engaging a valve stem 74 axially above seat 71, but said stem being with-drawable from said valve, thus permitting the valve to engage its seat by gravity when the lower part of pipe 54 is removed from the upper 1part thereof, as by disengagement of the oat from thedirigible. A spider 76 in the enlargement 70 serves as a guide for stem 74; and a springcatch 77 normally serves to tensionally engage the enlargements 70, 72, while the boat and dirigible are united.

The function of valve is to automatically close the passage through pipe 54 when the latter is severed.

In addition to the airplane engine 66, I also provide a marine motor for-the boat, the same being indicated at 78 as located in a compartment 79 in the stern of the boat, the shaft 8O of this motor having a water screw propeller 81.

Although in flight either of the composite craft entire, or of the dirigible and seaplane units separately, the air screw propellers only are serviceable, I am enabled through certain adjustment means to contribute power service from the marine motor for marine use only, the water screw propeller then adding its power thrust in water to the thrust in air of the air screw propeller for propulsion of the boat only orthe seaplane on water.

As will be noted in Fig. 2 the airplane motor 66 is horizontally pivoted to a forward standard 82, to thus have vertical movement about that axis, thereby effecting angular variation in the plane occupied by shaft 67, so that the thrust of propeller 68 may be exerted either horizontally or at a desired angle. For these adjustment purposes the rearward portion of the engine 66 is mounted upon a post 83 that is adjustable in height. This post is shown as supported upon the deck 64, and its detail construction is illustrated in F ig. 6.

Since the function of the post is to expand and contract in height, the reference numeral 83 by which it has been designated is applied in Fig. 6 to its vertically movable portion, which has, at its lower end, an internally threaded socket 84 with which a screw 85 is engaged; said screw having, at its lower end, a sprocket wheel 86 that engages a sprocket chain 87; while a sprocket wheel 88, to be more particularly referred to hereinafter, comprises a complementary l chain engaging member located in the stern part of the boat. The member 83 is connected by a sleeve coupling 89 with the shank 90 of a spherical head piece 91 that has ball joint engagement with a recess 92 in the rear port-ion of engine 66, which it thereby supports, said shank 90 being secured as by cross-pin 92a with sleeve 89 from' relative tlls turning so that sleeve 89 and part 83, being bound together by set screw 93, rotary motion imparted to screw 85 will move part 83 vertically. But upon loosening set screw 93, which is under the control of the pilot, the part 83 will then be freed and Will rotate With screw 85 without vertical move.

ment as the sprocket 86 is driven. Motion is imparted to chain 87 by a sprocket Wheel 94, that is mounted on. a vertical post 95, and is provided with a hand wheel 96 for manipulation by the pilot.

The sprocket Wheel 83 is carried by a post 97 that has threaded engagement with a boss 98, that is secured to the top 99 of the marine engine compartment. so that Vertical movement is accorded said post when rotated. Post 97 in pivotal engagement with a rearward part of the marine motor. which latter has its base mounted on a centrally transverse, rock-bearing 100, helical springs 101 forming front and rear supports beneath the engine base. Also a guide rod 102, operating in a guide 103. has pivotal engagement at 104 with the forward end of the engine base, and an intermediate spring 105,

to hold the'v tion of the vertical adjustment means for the airplane engine and the marine engine, that with theset screw 93 tightened, the ilot, by turning hand wheel 96, can either ower or raise`` the rearward portions of both said motors; while with set screw 93 loosened, the same operation will affect only the marine motor without disturbing theposition of adjustment of the airplane englne.

The purposes of these adjustments will be obvious, for with the air-screw propeller tilted so that its axis is inclined forwardly upward, the propeller thrust will tend to elevate the bow of the craft, this being desirable for climbing Hight, but also, in the case of a sea-plane or boat travelling on water, aiding the craft to skim the water surface like a hydroplane.

The same effect is aided, and additional driving power in water achieved, by depressing the water propeller 81 deeper into the water, for high speed. Both these objects may be-ac'complished in the same operation by the pilot rotating hand wheel 96 in the direction necessary to depress bothvmotors from their rear portions.

In my co-pending application Serial No. 243,565 I have described the interfitting sectional construction of the boat keel herein illustrated, but in said co-pending application no water-screw power plant is shown. Since I may employ the boat construction of application Serial No. 243,565 with my present invention I add thereto a rearward section 108 to comprise the housing for the water screw power plant 78 and as including the compartment 79.

The side pontoons or floats 97 extend from opposite sides of the boat hull, to which they are attached, and serve as steady/ing means to prevent excessive rolling of the boat. When the boat structure is employed for land travel, for which purpose it is provided with the wheels 1082*, then thelioats 97 serve to steady the craft against too great lateral motion.

In the showing of Fig. 11, the air screw propeller is there represented as applied to a craft that is capable of either surface or under surface operation, which'may be the form of flotation element employed in my 

